First off what kind of birds are these?
Next - this is not unusual if they both are hens. If these are canaries, 7 eggs is a huge clue you have 2 hens and 1 male not 2 males and 1 hen. Now can 1 canary hen lay 7 eggs, yes it can happen but so rare an event that I promise you, you have two hens in the same nest.
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